AUTONOMOUS SYSTEM

According to RFC, an autonomous system (AS) is a collection of IP networks and routers, under the control of one or more entities, that presents a common routing policy to the Internet. A unique AS number (or ASN) is allocated to each AS for use in BGP routing. With BGP, AS numbers are important because the ASN uniquely identifies each network on the internet. It is beneficial because Dynamic routing eliminates the need to reset routes manually. When network failures occur, routes are automatically re-routed.

So in essence an autonomous system (AS) is a set of networks and gateways that is administered by a single entity. Companies and organizations that wish to connect to the Internet and form an AS must obtain a unique AS number from the Internet Assigned Numbers Authority (IANA).

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